31708423 has 2 divisors, whose sum is σ = 31708424. Its totient is φ = 31708422.

The previous prime is 31708393. The next prime is 31708441. The reversal of 31708423 is 32480713.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31708423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31708391 and 31708400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31708493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15854211 + 15854212.

It is an arithmetic number, because the mean of its divisors is an integer number (15854212).

Almost surely, 2^31708423 is an apocalyptic number.

31708423 is a deficient number, since it is larger than the sum of its proper divisors (1).

31708423 is an equidigital number, since it uses as much as digits as its factorization.

31708423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 31708423 is about 5631.0232640258. The cubic root of 31708423 is about 316.5129966620.

It can be divided in two parts, 31708 and 423, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 31708423 in words is "thirty-one million, seven hundred eight thousand, four hundred twenty-three".